JP4309538B2

JP4309538B2 - Power recovery device

Info

Publication number: JP4309538B2
Application number: JP36343399A
Authority: JP
Inventors: 範之白澤
Original assignee: Kyocera Corp
Current assignee: Kyocera Corp
Priority date: 1999-12-21
Filing date: 1999-12-21
Publication date: 2009-08-05
Anticipated expiration: 2019-12-21
Also published as: JP2001175365A

Description

【０００１】
【発明の属する技術分野】
本発明は、電源回路の瞬断復帰を確実にする電源復帰装置に関する。
【０００２】
【従来技術】
携帯電話機等の携帯機器は電池パックをコネクタで機械的に機器本体に着脱自在に結合し、該電池パックの電池を主電源としている。上記のように電池パックはコネクタで機械的に着脱自在に結合するものなので、機器の振動等で瞬間的にコネクタの金属接続端子同士の接触が外れてしまう現象が生じる。これを瞬断という。電池電圧により所定の電圧を機器各部へ印加する主電源回路は通常、図４（ａ）に示すように電池電源が一旦、電圧値（Ｖ−DET）より下がり再び電圧値（Ｖ−DET）以上の電圧が加わった場合に電源を投入し、ある条件（例えば瞬断判定用のコンデンサの電圧が一定値以上残っていることを、もしくは内部メモリに瞬断状態が記憶されている等）が満たされていれば瞬断していたと判断し、そのまま電源が保持され、正常動作を行う。
【０００３】
このような従来技術は、例えば特開平８−３１４５５２号「電源回路」に記載されている。特開平８−３１４５５２号の発明は、図５にそのブロック図を示すように電源投入スイッチ回路２のスイッチＳＷを投入した時やあるいは電源ＯＮ状態で瞬断が発生すると、電源投入スイッチ回路２のトランジスタスイッチがオンされ電圧検出回路４に電源電圧が供給されてハイインピーダンスとなり微分回路５で微分信号を発生し、トランジスタスイッチ６が一定時間（１００ｍｓ）オンし、主電源回路３を起動する。この起動によりＣＰＵ７に安定化された電源電圧が供給され、ＣＰＵ７は電源保持信号ｉを主電源回路３に出す。以後、この電源保持信号ｉで主電源回路３は駆動される。
【０００４】
【発明が解決しようとする課題】
しかしながら、瞬断が極めて短時間で図４（ｂ）に示すように電池電圧が検出電圧（Ｖ−DET）を下回らずに復帰した場合、電源は切れてしまうが電源投入スイッチ回路２がオンされず電圧検出回路４が働かないため、再び電源が投入されることが無く、切れたままとなってしまう。
【０００５】
本発明は、このような課題に鑑みて、いかなる瞬断に対しても確実に電源復帰をさせる技術を提供するものである。
【０００６】
【課題を解決するための手段】
上記従来技術の課題を解決するために本発明は、交換可能な電池を主電源とし、該電池電圧に基づき機器内の各部へ所定電圧を印加する主電源回路が、該電池電圧の瞬断により動作停止した場合、該動作を復帰させるための電源復帰装置において、クロックと、該クロックのバックアップ電源とを備え、前記主電源回路の動作状態に係わらず前記クロックが所定時間毎に該主電源回路に対し電源オン信号を繰返し出力するようにした。
【０００７】
【発明の実施の形態】
図１は本発明の原理を示すタイミングチャートである。（ａ）は電池電圧、（ｂ）は主電源による供給電圧、（ｃ）はリアルタイムクロック（ＲＴＣ）による電源ＯＮ信号である。ＲＴＣは設定した時刻に信号を出力することができるので、動作中に一定時間Ｔ毎に電源ＯＮ動作を行わせる。即ち、正常動作中であれば、時間Ｔ後に電源ＯＮ動作が行われても既に電源はＯＮ状態であるから動作に変わりはない。また、この時点で現在時刻から時間Ｔ後に自動電源ＯＮ機能が再設定される。この動作を繰返すことで、極めて短時間の瞬断が発生し、主電源回路が停止してしまった場合でも、設定された時刻に電源が投入され、主電源回路は動作復帰する。よって電源が切れたままとなることがない。
【０００８】
図２は、本発明の一実施形態である電源再復帰装置のブロック図で、従来技術で説明した電源回路にＲＴＣ８とバックアップ用コンデンサ９を追加したものである。本例によれば、主電源回路３が電源保持信号ｉで動作している状態で、ＣＰＵ７はＲＴＣ８に時刻設定信号ｊを送る。ＲＴＣ８はＣＰＵ７の時刻設定信号ｊにて設定された一定時間間隔Ｔで目覚まし信号ｈを出力している。このような状態で図４（ｂ）に示す極めて短時間の瞬断が発生すると主電源回路３の駆動停止にともないＣＰＵ７もダウンするが、ＲＴＣ８のみはバックアップ用コンデンサ９により動作し一定時間Ｔ後に目覚まし信号ｈを出力する。既に電池電圧ｌは回復しているので、この目覚まし信号ｈで主電源回路３は再び起動し、したがってＣＰＵ７も復帰し再び電源保持信号ｉにて主電源回路３の動作を維持するものである。
【０００９】
また、他の実施形態としては図３に示すようなロジック回路にも適用できる。図３の例でもＣＰＵ７が電源保持信号ｉを出し、これはＯＲ回路ｄで電源ＯＮ信号ｋとなって主電源回路３を動作させ電池電圧ｌを所定電圧に安定させ各部へ印加する。電池電圧ｌは電池電圧検出回路４で監視されており、図４（ａ）に示す通常の瞬断では電池電圧ｌが復帰すると検出信号ｇが一定時間出力され、これがＯＲ回路ｄを通して主電源回路３をＯＮし、電源が入る。その後、ＣＰＵ７は電源保持信号ｉを出力するので、検出信号ｇがなくなっても電源ＯＮ信号ｋは保持され、電源は入ったままとなる。図４（ｂ）のような極めて単時間の瞬断が発生し電池電圧検出回路４が検出信号ｇを出せない場合は、ＣＰＵ７の電源保持信号ｉも停止してしまうが、ＲＴＣ８から目覚まし信号ｈは主電源回路３の動作状態に関係なく一定時間Ｔ毎に出力されているのでＯＲ回路ｄから電源オン信号ｋが出力され主電源回路３が復帰しＣＰＵ７が復帰する。
【００１０】
【発明の効果】
以上のように本発明は、交換可能な電池を主電源とし、該電池電圧に基づき機器内の各部へ所定電圧を印加する主電源回路が、該電池電圧の瞬断により動作停止した場合、該動作を復帰させるための電源復帰装置において、クロックと、該クロックのバックアップ電源とを備え、前記主電源回路の動作状態に係わらず前記クロックが所定時間毎に該主電源回路に対し電源オン信号を繰返し出力するようにしたので、如何なる瞬断が発生しても確実に電源を復帰させることが可能となる。
【図面の簡単な説明】
【図１】本発明の電源復帰装置の原理を示すタイミングチャート。
【図２】本発明の一実施形態を示す電源復帰装置の回路図。
【図３】本発明の他の一実施形態を示す電源復帰装置の回路図。
【図４】電池電源の瞬断時の検出電圧値を示すもので（ａ）は通常の瞬断時の図、（ｂ）は本発明が対象とする極めて短時間の瞬断時の電池電源電圧を示す図。
【図５】従来の電源復帰装置の回路図。
【符号の説明】
１：電池
２：電源投入スイッチ回路
３：主電源回路
４：電圧検出回路
５：微分回路
６：トランジスタスイッチ
７：制御手段（ＣＰＵ）
８：リアルタイムクロック（ＲＴＣ）
９：バックアップ用コンデンサ
ｄ：ＯＲ回路
ｇ：検出信号
ｈ：目覚まし信号
ｉ：電源保持信号
ｊ：時刻設定信号
ｋ：電源オン信号
ｌ：電池電圧[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power recovery device that ensures recovery from an instantaneous interruption of a power supply circuit.
[0002]
[Prior art]
A portable device such as a cellular phone mechanically connects a battery pack to a device main body with a connector in a detachable manner, and uses a battery of the battery pack as a main power source. As described above, since the battery pack is mechanically detachably coupled with the connector, a phenomenon occurs in which contact between the metal connection terminals of the connector is momentarily released due to vibration of the device or the like. This is called instantaneous interruption. As shown in FIG. 4 (a), the main power supply circuit for applying a predetermined voltage to each part of the device by the battery voltage is usually once the battery power supply falls below the voltage value (V-DET) and again exceeds the voltage value (V-DET). When a voltage is applied, the power is turned on, and certain conditions (for example, the voltage of the capacitor for determining instantaneous interruption remains above a certain value or the instantaneous interruption state is stored in the internal memory) are satisfied. If it is, it is determined that the interruption has occurred, and the power supply is maintained and normal operation is performed.
[0003]
Such a prior art is described in, for example, Japanese Patent Application Laid-Open No. 8-314552 “Power Supply Circuit”. In the invention of Japanese Patent Laid-Open No. 8-314552, as shown in the block diagram of FIG. 5, when the switch SW of the power-on switch circuit 2 is turned on or when an instantaneous interruption occurs in the power-on state, the power-on switch circuit 2 The transistor switch is turned on, the power supply voltage is supplied to the voltage detection circuit 4 and becomes high impedance, the differential circuit 5 generates a differential signal, the transistor switch 6 is turned on for a predetermined time (100 ms), and the main power supply circuit 3 is activated. By this activation, a stabilized power supply voltage is supplied to the CPU 7, and the CPU 7 outputs a power supply holding signal i to the main power supply circuit 3. Thereafter, the main power supply circuit 3 is driven by the power holding signal i.
[0004]
[Problems to be solved by the invention]
However, if the instantaneous interruption is very short and the battery voltage returns without falling below the detection voltage (V-DET) as shown in FIG. 4B, the power is turned off but the power-on switch circuit 2 is turned on. Since the voltage detection circuit 4 does not work, the power is not turned on again and remains off.
[0005]
In view of such a problem, the present invention provides a technique for reliably returning power to any instantaneous interruption.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, the present invention provides a main power supply circuit that uses a replaceable battery as a main power supply and applies a predetermined voltage to each part in the device based on the battery voltage. In a power recovery device for recovering the operation when the operation is stopped, the power recovery device includes a clock and a backup power source of the clock, and the clock is supplied to the main power circuit every predetermined time regardless of the operation state of the main power circuit. In response, the power-on signal was repeatedly output.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a timing chart showing the principle of the present invention. (A) is a battery voltage, (b) is a supply voltage by a main power supply, and (c) is a power ON signal by a real time clock (RTC). Since the RTC can output a signal at a set time, the power-on operation is performed at regular time intervals T during operation. That is, during normal operation, even if a power ON operation is performed after time T, the operation is not changed because the power is already on. At this time, the automatic power ON function is reset after time T from the current time. By repeating this operation, even if a very short interruption occurs and the main power supply circuit stops, the power is turned on at the set time, and the main power supply circuit returns to operation. Therefore, the power does not remain off.
[0008]
FIG. 2 is a block diagram of a power supply restoring apparatus according to an embodiment of the present invention, in which an RTC 8 and a backup capacitor 9 are added to the power supply circuit described in the prior art. According to this example, the CPU 7 sends the time setting signal j to the RTC 8 while the main power supply circuit 3 is operating with the power holding signal i. The RTC 8 outputs the wake-up signal h at a constant time interval T set by the time setting signal j of the CPU 7. In such a state, when an extremely short interruption shown in FIG. 4B occurs, the CPU 7 also goes down as the driving of the main power supply circuit 3 stops, but only the RTC 8 operates by the backup capacitor 9 and after a certain time T. The alarm signal h is output. Since the battery voltage l has already been recovered, the main power supply circuit 3 is started again by the wake-up signal h, so that the CPU 7 is also restored and the operation of the main power supply circuit 3 is maintained again by the power holding signal i.
[0009]
As another embodiment, the present invention can be applied to a logic circuit as shown in FIG. In the example of FIG. 3 as well, the CPU 7 issues a power holding signal i, which becomes a power ON signal k in the OR circuit d, operates the main power circuit 3 and stabilizes the battery voltage l to a predetermined voltage and applies it to each part. The battery voltage 1 is monitored by the battery voltage detection circuit 4, and in the normal momentary interruption shown in FIG. 4 (a), when the battery voltage l recovers, a detection signal g is output for a certain period of time, and this is output through the OR circuit d to the main power supply circuit. 3 is turned on and the power is turned on. Thereafter, since the CPU 7 outputs the power holding signal i, the power ON signal k is held even when the detection signal g disappears, and the power remains on. When a very short interruption occurs as shown in FIG. 4B and the battery voltage detection circuit 4 cannot output the detection signal g, the power holding signal i of the CPU 7 also stops, but the alarm signal h from the RTC 8 Is output every fixed time T regardless of the operation state of the main power supply circuit 3, so that the power supply ON signal k is output from the OR circuit d, the main power supply circuit 3 is restored, and the CPU 7 is restored.
[0010]
【The invention's effect】
As described above, the present invention uses a replaceable battery as a main power supply, and when a main power supply circuit that applies a predetermined voltage to each part in the device based on the battery voltage is stopped due to an instantaneous interruption of the battery voltage, A power recovery device for recovering an operation, comprising a clock and a backup power supply for the clock, wherein the clock supplies a power-on signal to the main power circuit every predetermined time regardless of the operating state of the main power circuit. Since the output is repeated, it is possible to reliably restore the power supply regardless of any instantaneous interruption.
[Brief description of the drawings]
FIG. 1 is a timing chart showing the principle of a power recovery device of the present invention.
FIG. 2 is a circuit diagram of a power recovery device showing an embodiment of the present invention.
FIG. 3 is a circuit diagram of a power recovery device showing another embodiment of the present invention.
FIGS. 4A and 4B show detected voltage values at the time of a momentary interruption of the battery power source, where FIG. 4A is a diagram at the time of normal momentary interruption, and FIG. 4B is a battery power source at the momentary momentary interruption targeted by the present invention; The figure which shows a voltage.
FIG. 5 is a circuit diagram of a conventional power recovery device.
[Explanation of symbols]
1: Battery 2: Power-on switch circuit 3: Main power circuit 4: Voltage detection circuit 5: Differentiation circuit 6: Transistor switch 7: Control means (CPU)
8: Real-time clock (RTC)
9: Backup capacitor d: OR circuit g: Detection signal h: Alarm signal i: Power holding signal j: Time setting signal k: Power on signal l: Battery voltage

Claims

When the main power supply circuit, which uses a replaceable battery as a main power supply and applies a predetermined voltage to each part in the device based on the battery voltage, stops operation due to an instantaneous interruption of the battery voltage, the power supply is restored to restore the operation. The apparatus comprises a clock and a backup power supply for the clock, and the clock repeatedly outputs a power-on signal to the main power circuit every predetermined time regardless of the operating state of the main power circuit. A power recovery device.